FIELD: equipment drilling for oil and gas.
SUBSTANCE: in compliance with invention cylindrical metal body is made of two pipes screwed together directly or through reducer. Surface of upper pipe has electric insulation coat and lower pipe is filled with ballast. Body carries conical nosepiece. Cable is connected to butt of upper pipe and is fixed by means of nut; butt is shut by plug from electric insulation material. Cable functions simultaneously as rope.
EFFECT: enhanced functional reliability while operating in seawater.
5 cl, 1 dwg
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